This file is indexed.

preinst is in rxvt-unicode-lite 9.19-1.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh
set -e

if [ "$1" = upgrade ]; then
    # clean up after old versions, unless the admin chose urxvtcd
    if ! update-alternatives --query x-terminal-emulator | grep -q \
            '^Value: /usr/bin/urxvtcd$'; then
        update-alternatives --remove x-terminal-emulator /usr/bin/urxvtcd
    fi
fi